Only problem with the design is being able to stand properly next to the anvil, so there is proper form for hammering. The cross supports between legs would hamper being able to do that without stooping to use it.
I like the idea of a long surface, though. A person could grind different radiused sections, allowing for fullering, or drawing out of the stock being worked. Weld on an old 1" socket, upside down for a hardy hole for various tools such as home-made swages, bending jigs, hot cut, etc.
Kind of like a Brazeal type anvil-all you need within easy reach, just move up and down the anvil.